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- W120255446 abstract "To compare the susceptibility of Porphyromonas gingivalis to metronidazole at different planktonic cell densities and in biofilm, and to evaluate the role of cell density in antibiotic drug resistance in Porphyromonas gingivalis biofilm.The minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of metronidazole against Porphyromonas gingivalis were detected by a broth dilution method under a final inocula of 10(6) CFU x mL(-1) and 10(9) CFU x mL(-1) (cell number equal to biofilm). After the initial biofilm formed in the microtiter plate wells, the MIC and MBC of metronidazole to the intact and succedent resuspended biofilm were determined.The MIC and MBC of metronidazole against 10(6) CFU x mL(-1) planktonic Porphyromonas gingivalis were 0.063, 0.125 mg x L(-1) respectively. However, those against 10(9) CFU x mL(-1) planktonic Porphyromonas gingivalis were 25, 50 mg x L(-1). Against intact Porphyromonas gingivalis biofilm, the MIC was 25 mg x L(-1) and MBC was higher than 125 mg x L(-1), those against resuspended biofilm was 25, 125 mg x L(-1) respectively.The resistance of Porphyromonas gingivalis to metronidazole increases along with the augment of the bacterial density. Cell density plays an important role in the resistance of biofilm. However, extracellular matrix and the integrity of biofilm may be the other influence factors for the biofilm resistance." @default.
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- W120255446 date "2011-12-01" @default.
- W120255446 modified "2023-09-23" @default.
- W120255446 title "[Susceptibility of porphyromonas gingivalis to metronidazole at different planktonic cell densities and in biofilm]." @default.
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